Screw press



y 'April I1o, 192s. y 1,665,202

R. CRAIG SCREW. PRESS led May l0. 1926 az, d han Patented Apr. l0, 1928.

A'ROBERT CRAIG, ,for rammelt;50H10.y

` screw rares.

Application ie May '10, 1926. fseriai noprozio.

'This invention :is 'an :improvement-on the screw press disclosed in myPatentl .No. 1f-,=3584l 8,issued November 9, v'1920, anfd has for itsprincipal object the provision' ofv a f lpossibility of the leverslipping out lof;

5 wheel and lever system which will be safe and l'easy :to operate,-andwhich ,will-.be simple in: construction, with no -sinal or delicateparts.

' 'f Presses of this 'type 'are lusuallyfitted V10 a hand wheeloperating a verticalrscrew.

When the wheel is rotated in Vone `direction the screw vis forceddownwardly against lwork 1 resting on the table `or bolster.' V-henrthewheel is rotated in thefother direction the screw is raised fromtherwork.'

Wheny a heavy pressure on the workv is required the Yeifective radius ofthe .hand wheel is increased' by :means of a horizontal lever engagingthe 'wheel 'andextending radially from it.

` .The press fisfusually fsomewhat V'taller thanV the operator. vThe,operating `wheel is near the top of the -machine, therefore when theoperating lever pr'ojectsjhorizontally from the /wheel the leverisgenerally at or near the heightof the operators shoulder. vSuc-haposition is satisfactory enough solong asV the work-'is light, but whena heavypull `is required the lever zis too high to permit the,

operator to work to the vbest advantage. q

Without using the lever, vbut heavy. work rehorizontally. IVhave.therefore arranged my hand wheel and-lever to bring the operatingend of the lever to a convenient height for easy and powerful operation.i

In the .former construction the lever was fulcrumed on the hub of thewheel and pressed against one of a series of upstanding lugs on the rimof the wheel. are a nuisance when the machine is operated by the handwheel alone because they offer a rough jagged grip for the hand of the0perator. The present design offers a smooth' grip, thereby lesseningwear and tear on the operators hands. L l

In the former design there was Vnothing to prevent the lever movingradially outward, ,which sometimes resulted in the inner end of thelever slipping ofi" the hub of the wheel while being operated, therebyresult-y ing in injury to the operator. Also, if while i the press wasnot in operation the lever were vvery iight work vis usuaury performedby the operator gripping thehand wheel itself Those lugs.

of sleeve 22. .Y

Collar 26 is made intwo or more sections left inoperativek position 'onthe: wheels" Vwould .sooner lor' lfater'fall oif and possibly causedamage. `'Ifhe present design perinits.

easyqlmlanipulation ofA the-lever, withgfno proper' position. eitherAwhile the machi'nesis 'inguseoridle'l A i The lever mayxbe instantlyengaged with or 4removed fromthe hand wheel.

The ppres'entdesign 'of wheel hub fand. itsV cooperating :parts .isparticularlyv advantageous from thep'oints of view'ofxaccessibirlity andease of oiling the 'thrustbearingsand screw. Y. In the drawings, whichshow `vvhat Ir'now -preferredfform ofthe in- Fig. 3 is a planfview on.liner-3;?) y' 'Ihe head of the machine, 'designated 10., isj

of cast iron or steelandz lis 'supported on pair'of hollow cylindricallegis '12, the upper and lower endsv ofwhich `are 'secured to. the head10" and feet =14 'by the v:leaded construe# tion disclosed in the abovementioned: patent'.

'The legs are perforated byaseries of horiinserted pins 18, upon whichfrests-thetable or bolster 20.

Secured to :thexunder'rrside center. fisV the `downwardly :projectingsleeve 22, provided at its 'lower eqndlwithza-Eflange 24. Supported onflange 24 by means of split collar 26 is the hand wheelr28.

screw 30 which passes through the head up- @f ite-aa 1c far as Zontalholes 16 into 4any. pafirjof l'which-lareV Thel y hub wheel 28 isthreadedrto cooperate with wardly into the hollow central'portion. ofhead 10. Screw 30 is prevented from turn@ ing relatively to head 10 ,bya horizontal pin lthrough the upper end of the screw,

which engages vertical slots`32 in head'lO.V A thrust collar 34 vofbronze or othersuitable material is provided between the upper surfaceof the wheel hub so as to permit ready assembly of the'parts. After theparts are in .position collar 26 is secured by screws 36.

Screw 30 is prevented from turning;

therefore, whenever wheel 28 is rotated,A lscrew 30 is raised orlowered.. Whenever andthe lower surfacev y l screw is not eXertingdownward pressure the weight of screw, wheel, and attached parts isVcarriedV by collar 26 which rests, on flange 24, but when the lowerendfof screw 30 contacts with work supported ontable 20, the screw andwheel are forced upwardly, raisingcollar 26 fromA iiange 24 and causingthe thru-st tobe taken on the upper and lower surfaces of thrust Acollar34, against flange 24 and hub 28,v respectiyely.

Itd will be noted that oil njected between vcollar 26. and sleeve 22willfind its way by gravity to all wearing surfaces, including thescrewthreads. y

For-light work the handwheel alone is suiiicient, but for heavypressures additional leverage isvnecessary, so theA extension lever40jis providedThe inner fend of the lever is fashioned with arcuateVprojections V42 whichV partially surroundv sleeve 22` when the lever isinoperative position. Extending downwardly from the underside of lever.V40 is a boss44 which is so located as toenter any one of the openings 46just inside the 'rim 48of, the wheel.' Openings 46 may be simply spacesVbetween adjacent spokes of the wheel, of if the wheei is providedlwitha disc-shaped web Ofninstead of spokes,

i' openings 46 may be .formed through 4the i are so thickened and shapedas to provide web.- In any event, the edgesof opening 46 a smoothcomfortable surface Vfor the operator7s hand when the lwheel is'handoperated,v and to' also provide sufficient strength Vwhenwthe machine islever operated. DuringV lever 'operation boss 44 isf moved from eachopening 46 to the next,` simply byraising lever 40 sufficiently topermit boss 44 to clear the intervening web or spoke. Itis evidentrthatthe downward slant of lever 40 will tend tokeep the outer side of bossV44 in contact with the inner surfacev of rimV 48,` and thatl rim 48Vwill always preventv the lever from being displaced radia'lly outwardfrom its operating position.

inaint-ain said boss in cont-act withsaid rim f f '1e is not limited'tothe specific details herein illustrated and describedj but can beein-V bodied in other forms without Vdeparture from its spirit.. I claimi 1l. In a screwpress, inV combination, a vertical screw7V a handV wheelthreaded on said screw, and a lever said wheel being provided with a rimanda plura'lity ofopenings through the wheel adjacent the rim', said'le#y ver being'providedwith aboss normally extending downwardly through oneofl said Y openings; said wheel and lever being so arranged thattheweight of the lever tendsto' for the purpose described.

2. In a screw press, in combination', a ver# tical screw, a hand wheelVthreaded on said` screw, a member supporting salidscrew and wheel, and alever; said lever being provid-A ed with a bifurcatedinner'endmeniberpand a downwardly extending projection; saidV wheel beingkprovided with a plurality Vof openings therethrough said member, wheel,

and 'lever being Iso arrangedthat normally Y the bifurcated end ofthelever engages said" member and the .downward projection of the leverenters an opening inthe wheel, said projectionV servingV the doublepurposev of turning said'wheel when the vlever is actu?- ated, and ofmaintaining thevlever in posi-V,

tion when the machine is idle.

Intestimony l whereof `I'hereto my -v signature.

vROBERT vrnniie'."y 5 l

